Anybody who spends time near a swamp can certainly hear that frogs use their voices to chitchat, however it wasn⤙t until about 20 years ago that researchers announced these animals also talk to water-transported protein pheromones.
Now a new study shows frogs banter with airborne chemicals too.
⤽It⤙s the first proof that frogs use volatile pheromones⤠to speak, says Schultz, a chemical ecologist at the Technical University of Braunschweig, in Germany. In fact, it⤙s the initial proof that any amphibians communicate using chemicals in mid-air, he adds (Angew. Chem. Int. Ed., DOI)
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⤽So few pheromones are already chemically identified in vertebrates, thus, making this really exciting news,⤠an amphibian biologist at Duquesne University. She highlights that biologists tried behavioral studies suggesting frogs used airborne pheromones, but none ended up identified until recently.
Within the new study, Schulz collaborated with TU Braunschweig zoologist Miguel Vences and Harvard University⤙s Katharina Wollenberg, who visited Madagascar to examine a local group of frogs called Mantellidae.
Male Mantellidae frogs have bulbous organs on the inner thighs called femoral glands, and it⤙s from these sacs how the team isolated two molecules that waft with the air as pheromones, namely 8-methyl-2-nonanol plus a macrolide called phoracantholide J.
The cs found that Mantellidae frogs will hop toward an assortment of both of these molecules understanding that different species have different ratios of which in their femoral glands. What specifically these frogs are saying with the molecules is up in mid-air, but Schulz has some speculations.
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⤽Frogs appear in high species diversity over these swampy areas-there are about 100 species,⤠Schulz says. Although the different species croak uniquely, the frog density is so high that ⤽it can be difficult to discover a mate from the correct species.⤠Perhaps the odors assist with species recognition, he suggests.
The new research also confirms the results of frog genome sequencing, Woodley says. Frog DNA has a variety of genes for volatile chemical receptors, but nobody knew whether or not they were functional genes or simply an artifact of evolution. ⤽It turns out they could be functional,⤠she adds.
Schulz⤙s team isolated a small number of other alcohols and macrolides from your frogs⤙ femoral glands, including a new natural product called gephyromantolide A. The cs also devised a brand new synthetic route for building the ringed molecules which uses a reaction called Corey-Nicolaou macrolactonization. The path, the shortest such path ever reported, provided enough sample to try which from the additional molecules are pheromones.
